You are right of course, that this doesn’t look correct.
Still I would like to know the source of light, as that could have an effect.
I have no idea, if the rear camera with the quad-pixel technology, that is advertised to enhance low light performance, could be the reason for the better performance, but I wouldn’t exclude it.
Do all the pictures taken with the front camera show that blueish colour?
If pictures taken at daylight are like that, it is clear, that there has to be something wrong.
In another thread on comparing old and new cameras, that you know as well, users said, that the front camera is much more of an improvement, than the rear camera. Given that, i would contact support, if the colour is distorted in all pictures. You should get a new one.
Edit:
I must have overlooked the posting that @Alex.A is referring to.
I wonder, if that problem is occuring only with upgrades of FP3 or if it happens with FP3+ as well, that come installed with the new modules. Should it happen on FP3 only, the problem might be with the phone rather than the camera. Just guesswork of course.